We know that when the rc submarine or ship model is on the water, it will be disturbed by wind or wave currents, which will directly lead to instability of the model. Today's topic is how to enhance the lateral stability of a submarine and use a very simple method so that more people can actually do it. In fact, there are many ways to increase the lateral stability of rc ships, and one effective way is to use a momentum wheel system to bring the ship to a dynamic and stable equilibrium based on the conservation of angular momentum and the tuning of the PID algorithm. But this is not the method I will discuss today. Today I will propose a simpler means to increase the lateral stability of a submarine. We all know that WWII submarines are easily unstable on the surface because of their slender hulls, so builders added a pair or even more pairs of bilge keels to the bottom of the submarine to increase the stability of the submarine. Nowadays, can we also increase the stability of a submarine (without changing the appearance of the submarine) by adding bilge keels? So, we can add bilge keels to the interior of the submarine hull, if not scientifically calculated, the bilge keels are at a 45 degree angle to the horizontal line and are connected to the bulkheads. The reason for this design is also simple, because we use wet hull structure, the whole WTC is submerged in water, when the submarine produces lateral roll (whether the submarine is stationary in water or in motion), the water inside the hull is stationary with respect to the bilge keel inside, while the bilge keel is swaying from side to side (in motion), so in such a reference system, the bilge keel is effective, because The stationary water dampens the moving bilge keel and by doing so increases the stability of the submarine. Here's a diagram that clearly shows what I think.

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